Data Sheet

Bluegiga Technologies Oy
Page 25 of 52
5 Wireless interfaces
The wireless connectivity on the module is implemented using two separate chips which share a 2.4GHz
antenna.
5.1 Bluetooth
The module is a fully qualified Bluetooth 4.0, Class 1, system, supporting both classical Bluetooth as well as
Bluetooth Smart (Bluetooth low energy) devices simultaneously.
5.1.1 Bluetooth GPIOs
Pin#
Function
Net name
72
Bluetooth GPIO 7
BT_PIO7
73
Bluetooth GPIO 8
BT_PIO8
74
Bluetooth GPIO 9
BT_PIO9
75
Bluetooth GPIO 25
BT_PIO25
Table 28: Bluetooth GPIO
These GPIOs are controlled by the Bluetooth baseband chip. The main processor can read and write them by
issuing special commands to the Bluetooth chip, making them suitable for use as status indicators, but not for
high speed signals. For the current status of software support, please refer to the software documentation.
Contact support if needed.
The pins are bidirectional pins with internal programmable strength pull-up or pull-down. By default they are
inputs with a weak pull-down.
5.1.2 Bluetooth Audio interface
Pin #
Net name
PCM function
I
2
S function
Debug interface
195
BT_SPI_PCM1N
Select Audio: GND
Select Audio: GND
Select Debug: +3.3V
196
BT_PCM1_IN
PCM in
Serial in (SD_IN)
MOSI
197
BT_PCM1_OUT
PCM out
Serial out (SD_OUT)
MISO
198
BT_PCM1_CLK
PCM clock
Serial clock (SCK)
Clock
199
BT_PCM1_SYNC
PCM sync
Write sync (WS)
Chip select (active low)
Table 29: Bluetooth audio and debug interface
The Bluetooth audio functionality can be configured to work in either I
2
S or PCM mode. In addition, the
Bluetooth chip’s debug interface is multiplexed with the audio pins.
The audio interface supports continuous transmission and reception of PCM audio data over Bluetooth.
Operation in either master or slave mode are supported and many different clock modes can be supported. A
maximum of 3 SCO audio links can be transmitted through the PCM interface at any one time.